How to get register GS value in plan9

I try to adapt go runtime to a libOS, and I need to get register GS value, which is used to calculate syscall function entry in libOS. But I can’t find any example in Go runtime.

@superajun-wsj I don’t think that register is known to Go’s assembler. The quick guide to Go’s assembler says to manually write the byte sequences for instructions the assembler doesn’t understand:

Thank you very much for your response, it indeed helped me.

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